can't find the high side A/C service port

[Dale Colton]

I just purchased A 1986 comanche with the Renault diesel engine, the truck has factory A/C. The system is empty. I went to hook up the gauge set and can not locate the high presure service port. The low side is on the line about 6 inches from the compressor. I have followed the high presure line from one end to the other including pulling the grill out to get a better look at the receiver dryer. The dryer does have a sight glass and limit switch. I do have the factory M.R.277 repair manual, nothing on port location in there. Thanks for any help.

Edited May 8, 2023 by Dale Colton
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[jdog]

I think it's on the compressor itself

[Dale Colton]

I looked the compressor over very carfully with no luck. I even looked where it might have been and was broken off. no sign of it.

[Ωhm]

From the Motor Manual Guy:

 

Air conditioning system
The air conditioning system consists of a condenser mounted in front
of the radiator, an evaporator mounted adjacent to the heater core,
a compressor mounted on the engine, a receiver-drier which contains
a high pressure relief valve and the plumbing connecting all of the above
components.